1. must not wrong color. No cracks or chips, and the gem will not move. 2. Peel the black gold not must not be based on the approved sample. 3. the edge of the work surface must be smooth, heart. No pattern or a scratch. 4. water connection must not mess up the solder does not overflow the edges of the workpiece. 5. the symbol coat pegs, "" ALE "and" S925 there must be clarity. Be able to identify the characters.
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